BRIEF [O.A.] Floerke, Wilhelm G... Author: Floerke, Wilhelm G... Recipient: Haeckel, Ernst Dating: 15.01.1905
BRIEF [O.A.] Floerke, Wilhelm G... Author: Floerke, Wilhelm G... Recipient: Haeckel, Ernst Corporation: Germania, Internationale Auskunftei, Inkasso- Agenturen- und Immobilien-Bureau Dating: 06.04.1905
BRIEF [O.A.] Floerke, Wilhelm G... Author: Floerke, Wilhelm G... Recipient: Haeckel, Ernst Corporation: Monistische Gesellschaft Cassel Dating: 03.06.1905
BRIEF [O.A.] Ernst [Prinz von Sachsen-Altenburg] Author: Ernst [Prinz von Sachsen-Altenburg] Recipient: Haeckel, Ernst Dating: 19.11.1893
BRIEF [O.A.] Gilsa, Freiherr von und zu Author: Gilsa, Freiherr von und zu Recipient: Haeckel, Ernst Dating: 17.10.1887